How to change the frame rate of video
You can use a speed strip in the video sequence editor. The one disadvatage of this method is that you will need to recombine your audio.

Steps:


Import movie in the video sequence editor
Shift-A>Effect Strip>Speed Control
Set the speed to Current FPS/Target FPS.
Render movie
Bring it back into video sequence editor, along with original. Hide the video from the original, and the audio from the accelerated strips.
Render again.